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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Alienware LEGACY WMI device driver
4 *
5 * Copyright (C) 2025 Kurt Borja <kuurtb@gmail.com>
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/wmi.h>
11#include "alienware-wmi.h"
12
13struct legacy_led_args {
14 struct color_platform colors;
15 u8 brightness;
16 u8 state;
17} __packed;
18
19
20/*
21 * Legacy WMI driver
22 */
23static int legacy_wmi_update_led(struct alienfx_priv *priv,
24 struct wmi_device *wdev, u8 location)
25{
26 struct legacy_led_args legacy_args = {
27 .colors = priv->colors[location],
28 .brightness = priv->global_brightness,
29 .state = 0,
30 };
31 struct acpi_buffer input;
32 acpi_status status;
33
34 if (legacy_args.state != LEGACY_RUNNING) {
35 legacy_args.state = priv->lighting_control_state;
36
37 input.length = sizeof(legacy_args);
38 input.pointer = &legacy_args;
39
40 status = wmi_evaluate_method(LEGACY_POWER_CONTROL_GUID, 0,
41 location + 1, &input, NULL);
42 if (ACPI_FAILURE(status))
43 return -EIO;
44
45 return 0;
46 }
47
48 return alienware_wmi_command(wdev, location + 1, &legacy_args,
49 sizeof(legacy_args), NULL);
50}
51
52static int legacy_wmi_update_brightness(struct alienfx_priv *priv,
53 struct wmi_device *wdev, u8 brightness)
54{
55 return legacy_wmi_update_led(priv, wdev, 0);
56}
57
58static int legacy_wmi_probe(struct wmi_device *wdev, const void *context)
59{
60 struct alienfx_platdata pdata = {
61 .wdev = wdev,
62 .ops = {
63 .upd_led = legacy_wmi_update_led,
64 .upd_brightness = legacy_wmi_update_brightness,
65 },
66 };
67
68 return alienware_alienfx_setup(&pdata);
69}
70
71static const struct wmi_device_id alienware_legacy_device_id_table[] = {
72 { LEGACY_CONTROL_GUID, NULL },
73 { },
74};
75MODULE_DEVICE_TABLE(wmi, alienware_legacy_device_id_table);
76
77static struct wmi_driver alienware_legacy_wmi_driver = {
78 .driver = {
79 .name = "alienware-wmi-alienfx",
80 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
81 },
82 .id_table = alienware_legacy_device_id_table,
83 .probe = legacy_wmi_probe,
84 .no_singleton = true,
85};
86
87int __init alienware_legacy_wmi_init(void)
88{
89 return wmi_driver_register(&alienware_legacy_wmi_driver);
90}
91
92void __exit alienware_legacy_wmi_exit(void)
93{
94 wmi_driver_unregister(&alienware_legacy_wmi_driver);
95}